Messing with doxygen's man-pages generation
Created a script to convert doxygem XML to man-pages, gen-man-pages.pl. Added grouping and other doxygen tags needed for man/HTML generation to db_type.h and db_value.h.
Added missing params
Fixed void param handling
Put defines in synoptsis, put functions in description summary for modules, handle function pointers.
Warn on more stuff
Small correction to group/module db_value description
Revamped documentation structure for a few files
Small miss when revamping db_enum.h